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https://issues.apache.org/jira/browse/HBASE-17437?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16510471#comment-16510471
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Zach York commented on HBASE-17437:
-----------------------------------
Looking briefly at the code it seems that rootdir should be renamed to walDir
(to more accurately describe what it does), but the code looks correct to me.
WalDir is being passed in as rootDir ever place WALSplitter is getting
initialized.
> Support specifying a WAL directory outside of the root directory
> ----------------------------------------------------------------
>
> Key: HBASE-17437
> URL: https://issues.apache.org/jira/browse/HBASE-17437
> Project: HBase
> Issue Type: Improvement
> Components: Filesystem Integration, wal
> Affects Versions: 1.2.4
> Reporter: Yishan Yang
> Assignee: Zach York
> Priority: Major
> Labels: patch
> Fix For: 1.4.0, 2.0.0
>
> Attachments: HBASE-17437.branch-1.001.patch,
> HBASE-17437.branch-1.002.patch, HBASE-17437.branch-1.003.patch,
> HBASE-17437.branch-1.004.patch, HBASE-17437.master.001.patch,
> HBASE-17437.master.002.patch, HBASE-17437.master.003.patch,
> HBASE-17437.master.004.patch, HBASE-17437.master.005.patch,
> HBASE-17437.master.006.patch, HBASE-17437.master.007.patch,
> HBASE-17437.master.008.patch, HBASE-17437.master.009.patch,
> HBASE-17437.master.010.patch, HBASE-17437.master.011.patch,
> HBASE-17437.master.012.patch, hbase-17437-branch-1.2.patch,
> hbase-17437-master.patch
>
>
> Currently, the WAL and the StoreFiles need to be on the same FileSystem. Some
> FileSystems (such as Amazon S3) don’t support append or consistent writes.
> These two properties are imperative for the WAL in order to avoid loss of
> writes. However, StoreFiles don’t necessarily need the same consistency
> guarantees (since writes are cached locally and if writes fail, they can
> always be replayed from the WAL).
>
> This JIRA aims to allow users to configure a log directory (for WALs) that is
> outside of the root directory or even in a different FileSystem. The default
> value will still put the log directory under the root directory.
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